| Cite this article: | 王 坤,陈 林,庞丹波,等.宁夏中部干旱区降水量及可利用降水量多时间尺度变化特征分析[J].灌溉排水学报,2022,(10):-. |
| WANG Kun,CHEN Lin,PANG Danbo,et al.宁夏中部干旱区降水量及可利用降水量多时间尺度变化特征分析[J].灌溉排水学报,2022,(10):-. |
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| Analysis of multi-time scale variation characteristics of precipitation and available precipitation in arid area of central Ningxia |
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WANG Kun1,2,3, CHEN Lin4,2,3, PANG Danbo4,2,3, LI Xuebin4,2,3, SHA Huan1,2,3, PENG Niu1,2,3
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1.School of Agriculture，Ningxia University, Yinchuan;2.Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan;3.Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan;4.College of Ecological Environment, Ningxia University, Yinchuan
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| Abstract: |
| Abstract: 【Objective】 To study the variation characteristics of precipitation and available precipitation in the arid area of central Ningxia from 1969 to 2020 at different time scales, and to provide a reference for local water resources utilization and disaster prevention. 【Method】 Based on the precipitation and monthly average temperature data of six meteorological stations in the arid area of central Ningxia from 1969 to 2020, the distribution of precipitation, the evolution trend and cycle law of abundance and disadvantage in the arid area of central Ningxia were studied by using Koichiro Takahashi's evapotranspiration formula, climate trend method, Mann-Kendall mutation test and wavelet cycle analysis. 【Result】 (1) The precipitation in the northwest and southeast regions of the arid region of central Ningxia was quite different, with precipitation of 188.0 mm and 304.1 mm, and available precipitation of 17.8 mm and 58.9 mm, respectively. (2) Precipitation in the arid areas of central Ningxia is mainly concentrated in summer, accounting for about 57% of the year; winter is the least, accounting for only 3% of the year, and the intra-year and interannual changes are gentle; the available precipitation rate in spring and winter is low. (3) Interannual precipitation water resources in the arid area of central Ningxia will change from fluctuation period to dry period; the extreme rainfall phenomenon in the southeast region is more obvious than that in the northwest region, and the available precipitation water resources in the northwest region are more abundant before 2013. (4) Trend analysis shows that the annual precipitation and available precipitation in the southeast region will increase significantly at a rate of 1.539 mm/a and 0.467 mm/a, respectively, and the precipitation in the northwest region will increase significantly by 0.647 mm/a, and the available precipitation will decrease by 0.073 mm/a, but there is no significance; the mutation analysis shows that 2010 is the year when precipitation in the arid area of central Ningxia began to mutate. (5) Precipitation and available precipitation in central Ningxia are mainly based on 9, 12~13, 40 a as the main cycle, and the corresponding oscillation periods are 6, 9 and 25 a, respectively. The variable rate of available precipitation is large, which has a greater impact on agricultural and animal husbandry production activities. 【Conclusion】 The southeast region of each precipitation resource in the arid region of central Ningxia is more abundant than that in the northwest region; the seasonal annual precipitation and available precipitation are all summer> autumn> spring > winter; future precipitation and available precipitation have a significant upward trend, and precipitation water resources evolve towards a large-cycle scale. |
| Key words: Arid region of central Ningxia; Precipitation available; precipitation Multi-time scale; Mann-Kendall mutation test; wavelet analysis |
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